|Vub| from Exclusive Semileptonic B to pi Decays
Jonathan M Flynn, Juan Nieves
Abstract
We use Omnes representations of the form factors f+ and f0 for exclusive semileptonic B to pi decays, paying special attention to the treatment of the B* pole and its effect on f+. We apply them to combine experimental partial branching fraction information with theoretical calculations of both form factors to extract |Vub|. The precision we achieve is competitive with the inclusive determination and we do not find a significant discrepancy between our result, |Vub| =(3.90+/-0.32+/-0.18)10(-3), and the inclusive world average value, (4.45+/-0.20+/-0.26)10(-3).
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